Let's ask the guy who wrote those passages.
Whoops!
Galatians 3:21 Is the law then against the promises of God? God forbid: for if there had been a law given which could have given life, verily righteousness should have been by the law.
Man has the ability to keep the law perfectly but not the will!
Why did you not address Paul's words where he said this:
"For I was alive without the law once: but when the commandment came, sin revived, and I died. And the commandment, which was ordained to life, I found to be unto death" (Ro.7:9-10).
If it is impossible for a person to keep the law perfectly and therefore receive life then why would Paul speak of the commandment being "ordained to life"?
Why didn't you address what Paul wrote here:
"For not the hearers of the law are just before God, but the doers of the law shall be justified" (Ro.2:13).
If it was theoretically impossible for those under the law to be justified before God by law-keeping then it certainly would make no sense for Paul to say that
"the doers of the law shall be justified."
You addressed neither of these things! Whoops!